Antlia Dwarf Galaxy

A small dwarf spheroidal galaxy,
of low surface brightness, that lies about 3.75 million light-years away
in the constellation Antlia and is an outlying member
of the Local Group. It was discovered
only in 1997.

The Antlia Dwarf seems to be dominated by an old stellar population, similar
to what has been found for most other dwarf spheroidal galaxies in the Local
Group. However, unlike any of these, the Antlia Dwarf seems to contain a
cloud of atomic hydrogen gas at its center with a mass of about 800,000
solar masses. It remains to be understood why a galaxy that is relatively
gas rich has no young or intermediate-age stars.